Hello there

When you will fill the registration form for the first time then also you will find out that the candidates have the option to apply for one session or for more than one session that is for both April and May together and pay the examination fee for both the sessions. Now as you are saying then I can think that you have pays the examination fee for one session only so again if you want to appear for the next session then as like the previous one you have to do the process accordingly.

I hope it helps you!

Good luck!